This is pretty serious stuff!

Angelina Jolie sat down with the FBI at her temporary Malibu home last Tuesday, October 18, and answered questions for four hours about the September 14 private jet incident in which Brad Pitt drank and allegedly made physical contact with son Maddox, reports Us Weekly.

Two agents spoke to Jolie and some of her six children about the marriage-destroying event, according to the report. An insider said, “The agents wanted a breakdown of everything that happened from when the plane took off to when it landed."

“They’re looking into charges of assault,” added the source. According to another source, Jolie, who filed for divorce days later, “fully cooperated."

Meanwhile, it was previously reported that Pitt's child abuse investigation would likely be dropped and that Jolie wasn't going to help authorities, but now Us Weekly is reporting the Los Angeles County Department of Children and Family Services has extended their investigation of the 52-year-old actor.

"It’s normal [for the DCFS] to extend past the deadline to complete their work when an agreement exists between the parties,” a source tells the mag. Still, investigators will be looking into whether there are any other incidents or behavioral patterns that may indicate a history of abuse. “They are looking at not only the original incident but other possible incidents surrounding it and more history," the source said.

It was reported that Pitt didn't hit his son during the incident, but that there was "contact" made. Maddox refused to attend a monitored visit with Pitt last week, while his other siblings, Pax, 12, Zahara, 11, Shiloh, 10, and 8-year-old twins Knox and Vivienne opted to go. However, a few days later, the two finally met up, at a therapist's office.

The original protective order was put in place until October 20, and that has been extended, pending the investigation.